Return first non NaN value in python list

Return first non NaN value in python list

You can use a simple loop to iterate over the list and return the first non-NaN value. Here's how you can do it:

import math def first_non_nan_value(lst): for value in lst: if not math.isnan(value): return value return None # Return None if all values are NaN # Example usage: my_list = [float('nan'), 5, float('nan'), 10] result = first_non_nan_value(my_list) print("First non-NaN value:", result)

In this example:

  • The first_non_nan_value function iterates over the elements of the list.
  • It checks if each element is not a NaN value using the math.isnan() function.
  • If a non-NaN value is found, it returns that value.
  • If no non-NaN value is found, it returns None.

Make sure to import the math module to use the math.isnan() function.

Examples

  1. How to find the first non-NaN value in a Python list?

    Description: Learn how to retrieve the first non-NaN value from a list in Python.

    def first_non_nan(lst): for item in lst: if not isinstance(item, float) or not math.isnan(item): return item

  2. Python: Get the first non-NaN element from a list

    Description: Find a Pythonic way to extract the initial non-NaN element from a list.

    import math def first_non_nan(lst): return next((x for x in lst if not isinstance(x, float) or not math.isnan(x)), None)

  3. Retrieve initial non-NaN value from Python list

    Description: Discover a method to retrieve the first non-NaN value from a Python list.

    import math def first_non_nan(lst): for item in lst: if not isinstance(item, float) or not math.isnan(item): return item

  4. How to find the first non-NaN element in a list using Python?

    Description: Learn how to efficiently locate the first non-NaN element in a Python list.

    import math def first_non_nan(lst): for item in lst: if not isinstance(item, float) or not math.isnan(item): return item

  5. Python list: Retrieve initial non-NaN element

    Description: Explore a method to retrieve the first non-NaN element from a Python list.

    import math def first_non_nan(lst): for item in lst: if not isinstance(item, float) or not math.isnan(item): return item

  6. Get first non-NaN value from Python list

    Description: Find out how to extract the first non-NaN value from a Python list efficiently.

    import math def first_non_nan(lst): for item in lst: if not isinstance(item, float) or not math.isnan(item): return item

  7. Retrieve initial non-NaN value in Python list

    Description: Discover a method to retrieve the first non-NaN value from a Python list effectively.

    import math def first_non_nan(lst): for item in lst: if not isinstance(item, float) or not math.isnan(item): return item

  8. Find first non-NaN element in Python list

    Description: Learn how to find the first non-NaN element in a Python list efficiently.

    import math def first_non_nan(lst): for item in lst: if not isinstance(item, float) or not math.isnan(item): return item

  9. Python: Extract initial non-NaN element from list

    Description: Find a Pythonic way to extract the first non-NaN element from a list.

    import math def first_non_nan(lst): return next((x for x in lst if not isinstance(x, float) or not math.isnan(x)), None)

  10. How to get first non-NaN value from Python list?

    Description: Explore methods to retrieve the first non-NaN value from a Python list.

    import math def first_non_nan(lst): for item in lst: if not isinstance(item, float) or not math.isnan(item): return item

More Tags

derived-class intellij-idea keytool simpledateformat vue-router react-proptypes httpresponse spring-data kafka-producer-api hibernate

More Programming Questions

More Mortgage and Real Estate Calculators

More Housing Building Calculators

More Retirement Calculators

More Biochemistry Calculators